Sennheiser CX 680 Sports

Sennheiser CX 680 Sports : ACQUA Frequency Response

Our linear frequency response test measures how well-matched the left and right ears’ drivers are. Ideally, as in the case of our standard for this test—the Etymotic ER-4S—both lines would come close to resembling a single line. The CX 680 doesn’t fare nearly as well as the ER-4S, but we’ve certainly seen pairs that were far less matched than this.